Abrasive device



N0V- 26, l929 l F. o. ALBERTsoN Er AL ABRAS IVE DEVICE Filed April 41s,41927 www f Melina/1( fwwd' QM.

` Patented Nev. 2e, 1929- UNITE-D s'rnxrlazsl PATE-.Nr ori-lcs rnANs o.ALBEa'rsoN AND eUsrAv oLsEN, br sioux crrY, rowA, AssreNons 'rcALBEivrsoN a COMPANY, me., or sioux CITY, rowA, A coRronA'rIoN or'IowAABRASIVE DEVICE Application led April 18, 1927. Serial No. 184,476.

The present invention relates to improvements in abrasive devices, beingmore particularly concerned with grinding wheels which are adapted to beused for smoothing and polishing operations.

`Oneof the objects of our invention is the provision of an abrasivewheel having a padded ri`m with a longitudinal slit therein, which isadapted to permit the application of stantially cylindrical rim 12, ahub 13, and

a web 14 connecting the hub and rim.`

' lhe web 14 is lpreferably not centrally disposed between the edges ofthe rimf12 in order to provide convenient space for a tightening yoke 15supported upon the hub 13, and

the rim 12 is providedwith a longitudinal aslot 16 of sufficient widthtopermit the passage of two layers of thickness of any abraan abrasiveband about said rim, with therJ sive band which may be used with thewheel.

ends of the band projecting inward toward the hub of the wheel, togetherwith an eRective tightening device for said band, adapted to permit thequick substitution of anew `abrasive band with a minimum expenditure oftime and labor. I Another object of our invention is the provision of anabrasive wheel of the "class described, having a simple and eective bandtightening device, comprising means f or holding the ends of the bandabout a clip, resilient clampin means for clamping the folds of said banon said clip, a tightening yoke, and a pivotal connection between saidok'e and clip to permit the uniform tensioning of the band upon thewheel.

Another object of our invention is the provision of an abrasive wheel ofthe class described, which is light, well balanced, dura.-

ble, and which can be economically manufactured.

Other objects andadvaiiiiages of our invention will appear more fully,from the following description and from the accompanying drawings, inwhich similar characters of reference indicate similar parts throughoutthe several views.

i Fig. 1 is -a side, elevational view of our abrasive wheel. f

Fig. 2 is a cross sectional v iew taken, on

the line 2-V-2 of Fig. 1.

Fig. 3 is a detail v1ew,.1n perspective, of

the clip employed in fastening the ends of the band. y

Fig. 4 is a detail view, in perspective, of the resilient clamp employedwith said clip.

Fig. 5 is a similar view ofthe fastening pin. Referring to Figs. 1 and2, 10 indicates, in itsl entirety, our abrasive wheel whichvcomprises acast metal wheel 1 1 having a sub-` extremely hi yided wi The exteriorsurface of the rim 12 is vcovered with a layer of heavy felt 17coniprising a band of felt of a width equal to the width of the rim andof a length sufcient to extend Dfrom one edge of the slot 16 about therim of the wheel to. the opposite edge of the slot 16.

` The felt bandfl' is tightly stretched about.`

the rim 12 and securedthereto by a pluralit of rows of rivets. .18passing through the fe t '17 maybe rounded off in'order topresent arounded surface, labout which the abrasive band .may be bent.

"The web 14 is preferably cut awayl ada@ cent -the inside edge of therim 12 at the s ot -16 to provide an-aperture20 for the reception of theabrasive ,band tightening device. In

order to balance the wheel dynamically,j a plurality of yother apertures21 may be made as required in the web, removing sufficient thereof tosubstantially balance the wheel when the ti htening device of relativelyheavier metal is supported thereon.

The wheel 11 is preferably cons cast aluminum in order to provide a verylight wheel which is capable o being operated at may be use which issupported by hand.

The hub'13 is provided with an axial bore y 23 vand the hub' ispreferably `formed rof greater length upon that side ofthe 'web l whichis toward theA center 'of the rim or` wheel tructed of rotative speedsand whichA if desired, upon, apparatus forming. a boss 24, in order tosupport the i tightening yoke 15. The boss 24 may be pro- Alatsides25-inyplanes on each sides 10o i of the boss which are parallel to theplanepassing through the axis of -the wheel and the slot 16. i The yokecomprises a cast aluminum member of substantially U-shape, having a pairof legs 26 of vsubstantially rectangular cross section and adapted tofit upon the flat sides 25 of the boss 24, to be supported thereon forsliding movement. The juncture of the lo legs 26 on the yoke 15 may be'enlarged to form a head 27, providing an additional thickness for theyoke about a threaded bore 28. The bore 2 8 is adapted to receive athreaded bolt 29 havin a non-circular head 15 3() which ispreferablylexagonal, to permit the application of a wrench in anyposition of the head. l ./u' i The ends 31 of the legs 26 on the yokemay be inwardly turned to provide a stop, limiting motion of the yoke inone direction upon the boss 24, and the inside of each end of the yokemay be curved to ft the contour of the adjacent part of the hub. Theends 31 of the ,Y legs 26 also project parallel toeach other 2li-abovethe aperture 20 in the rim, the spacing of .the ends 31 being sufficientto receive between them the resilient clamping member 32 and clip 33 ofthe fastening device. L

Thelength of, the boss 24 is preferably equal to the thickness of theyoke so that the upper surfaces of the boss 24 and 4the yoke coincide,and the yoke may be retained upon said boss by a washer 34 secured upontheY same by a hollow bolt 35 having a head 36'.`

35 4The hollow bolt 35 may have a threaded bore 37 in such manner thatthe bolt and bore may f provide a convenient fastening means forclamping the hub upon any actuating member such as a shaft. v

The web 14 may also be provided with a slightly projecting. concentricboss 55 about the boss 24 which is adapted to provide a guide for theyoke 15. Y The abrasive means employed with ou wheel preferably consistsof av band 38 ofV paper or fabric, such as emery cloth or sandpaper,preferably the former, having its exterior surface covered with amultiplicity of sharp, projecting grains. The band 38 passes n V aboutthe entire rim 12 upon the layer of felt 17, havin both ends projectinginwardat the slot 16 w ere they are secured to afastening device furtherto be described. The band employed is preferabl of the same width as therim ofthe wheel b width if desired.

The fastening device .for he ends band 38 comprises a clip 33, hown indetail in Fig. 3, a resilient clamp 32, shown in de- P9 tail in Fig. 4,and a pin 39, shown in Fig. 5.

The clip 33 comprises a flat sheet'of. metal, .preferably steel which isbent back upon itself to form a double layer, :is at 40, after which theupper ends of theplate are again folded v 05. back in substantiallyU-shape, forming downut may be of augreater 'of' the wardly turnedlflanges 41. The iianges 41 arev spaced from the double layer 40 adistance sufficient to receive a single layer of the abrasive band andthe lower end of the doublef layer is provided withan aperture 42adapted to receive the pin 39. The metal on eitherside of the aperture42 may be cut away, as at 43, toreduce the weight of the clip and to reare spaced sufficient to receive the lower end" 0f the double layer 40.The flanges 45 are "then bent outwardly, as at 46, curved in, as at 47,and finally curved outward, as at 48, at

their edges to provide a resilient clamp which will fit .upon the clip33, having fingers 49 upon each side ofthe clip which are adapted topress against the same.

The ranges 45 are likewise pmvided with Varl-aperture 50 whichis adaptedto register with the aperture 42`iof the clip when in assembled relationand to receive the pin 39. The thickness of thehcombined clamp and clipat its lower end, adjacent the apertures 42 A and 50, is slightly lessthan the distance between the ends 31 of the yoke, and the ends 31 ofthe yoke are likewise provided with an apertnre 51' which mav'be made toregister with the apertures 42' and 50. The pin 39 may then be passedthrough the ends of the yoke, as well as the resilient clamp 32 andtheclip 33, thereby pivotally fastening these members together, the pinbeing retained in such position by the shearing force placed -onthe pinwhen the tightening'device is drawn up. t

The pin 31 comprises an ordinary steel pin,

having a knurled head 53 for convenient gripping by thelingers and arounded end .54. which 'is adapted to aid in its insertion Vthrougltithe fastening device.

The assembly of the foregoing parts is as follows: Y

The abrasive band 38 may be formed into substantially cylindricalshapewith its ends inwardly turned as they would be disposed in the slot'16.Each end of the band is then folded upward and placed between thedownwardly turned flanges 41 and the body of the clip 33.

in the clip 33, the ban being folded upward about the end 52 of theflange 41 in position to pass Vout at the slot 16 of the wheel, Withboth ends of the band disposed in this position, the resilient clamp 32is forced upon the clip 33, the fingers 49 pressing the folds of theband 38 againstthe flanges/41. The resilient clamp 32 having beenadjusted with' its aperture 50. aligned with the aperture 42 of theclamp, the inwardly turned ends ofthe The band 38 will th n have its enddisposed- 3.8 may be slid laterally into the slot 16, .and at the sametime the balance of the band will easily slide Vabout the 'felt coveredrim 12 of the wheel. ,7

The bolt 29in the head 27 of the yoke -may be withdrawn until the yo'keis moved toward the fastening-device so that the aperture 51 in the yokemay be aligned with the .apertures 42. and 50 of the fastening device..The pin 39 may then be passed through the-ends. of

,the yoke, the resilient clamp and the clip,

thereby pivotally fastening these parts to- .gether, andl the band 38may be tightened by screwing in the bolt 29. i,

The bolt 29 will bear against the boss 24,

forcing the yoke downward, in Fig. 1, and

a simple and edective fastening means for they ends of the abrasive bandby simply folding such ends about the flanges of the `the adjacentportions of the band 38 against clip and pressing-them against saidflanges.

.This fastening device requires no holes in the abrasive band, nor anybolts norscrews t0 fasten the`ends of the abrasive band. J

The employment .of a simple pin connection between the yoke andfastening device likewise enables':-the detachment of these partswithout the application of specialtools, and

t ie only point at which a wrench or tool -must' be employedis in theoperation of the bolt 29j which tightens the band. Y Y

The narrow slot 16 likewisetends to press the ianges 41 when thesepartsl are tightened,

and the narrowness ofthe slot also rendersthe rim of the wheelpractically continuous'.l i It will lthus be observed that we have-in#vented an abrasive wheel which'is vwell balanced,light anddurable, andwhich comprises afasten-ing device for an abrasive band which is readilyand quickly detachable for lthe substitution of a new bandv withoutloss. et time or'labor.A

` Our` tightening device is also adapted to `I Y draw lin both edges ofthe band lwith equal force. thereby uniformly stretching the band.

upon all parts of the rim of the wheel.

Whllewe have illustrated and described a specific embodiment of ourinvention, many v the appended claims.

modifications may be made without departing -from the 'spirit of theinvention, andwe d0 not wish to be4 limited 'to the precise details of fconstruction set forth butdesire to avail ourselves of'all changeswithinthe scope of We claim.: y Y 1. In an abrasive-device, the combinationsaid rim having a longitudinal slot through the same, with anabrasivebandy extending about said' rim and having its ends projecting throughsaid s lot, securing meansq for the ends of said band, and tighteningmeans comprising a yoke slidably engaging said hub, a screw bearingV onsald hub and a removable. pin pivotally connecting said yoke and securmgmeans.

2. In' an abrasive device, the combination of a\metal wheel comprising ahub, a rim, and means supporting said rim on said hub, said rim having alongitudinal slot through the same, withan abrasive band extending aboutsaid rim and having its ends projecting through said slot, securingmeans for the ends of said band, tightening means com.-

Vprising a yoke slidably mounted on said its rim andextending through aslot in said rim withv means for securing` one endof said band, meansfor securing the other end of said band comprising asheet metal memberhaving a backwardly turnedflange, said end passing over'said fiange,bending aboutv'the end thereof and lying'between said liange and member,a spring clip clamping said band `against said flange, and means fortightening said band. A

Y 4. In an abrasive device, the combination of a wheel havin band meansfor securing the other end of said band comprising a sheet metal memberhaving a backwardly turned flange, said end passing over said flange,,bending about the en d`thereor` and lying between said flange andmember, a s ring. cli band against said ange, an means fortighteningsaid band comprising a yoke passing about a hub on said wheel,a'4 screw bearing against said hub, and a pin passing through thends ofsaid yoke and said sheet .metal member and spring clip. v

-5. In an'abra'sive device,the combination of an abrasive band and meansfor removably securing the ends of lsaid band toa tightening device,said means) comprising a sheet .metalmember bent back upon itself` anabrasive bandabout its rim and exten ing through a slot 1n said rim withmeans for securing one end of said clamping said the opposite direcotionfrom said flange, and removable clamping means for holding said bandfolded about said flanges. Y i

. 6. ln an abrasive device, the combination of an abrasive band andmeans for removablyY securing the ends of said band to a tightv of saidsheet metal member, and being folded about the end of a flange extendingin the opposite direction ,from said flange, removable clamping meansfor holding said band k folded about said flanges, and means forconnecting said first-named means to a tighten-h ingl device comprisinga pin loosely. passing through said sheet metall member, clampingmeans'and device. 7. In an abrasive Wheel, the combination of a Wheelhaving a hub, rim and .means to join said huband rim, said rim havin alongitudinal slot, with an abrasive ban about said rim with its endspassing through said slot, erband tightening device slidably mounted onsaid hub, and a quick detachf able connection between the ends of 'saidband and said device, said connectionl including means for folding theends of the band about a securing member, and resilient means to holdsaid ends in folded condition.

8. In an abrasive device, the combination o'f a slotted sup ort having ahub with an v abrasive band a out said support and exsaid band aboutsaid support comprising a l 4o-V tending into said slot, meansforktightening member slidably engaging about said hub, and a separatespring clip detachably secured to said member and adapted to receivebackwardly turned ends of s aid bad to receive the same to said member.

9. In an abrasive wheel, a securindg device i comprising a metal memberVforme with a pair Vof backwardly extending flanges spaced from thebod)7 of said member to receive theends of a band folded about saidflanges, and resilient-means carried b said bod)7 for pressing said bandabout said iianges.

n witness whereof, We hereunto subscribe i ournames this 14th day ofApril, 1927.

y FRANS O. ALBERTSON.

GUSTAV OLSEN.

